P6 v7 -Unable to connect to database

I encountered this problem a few times. On other PC's when I installed P6 v7 stand alone, it won't start. After I input the password it does not start the program but gives a message "Unable to connect to database.". In one laptop I installed it a few weeks ago and it run perfectly then sudddenly today it didn't and showed the message "Unable to connect to database.". Does anybody have this experience and if so, is there a solution?

I am trying to connect P6 v 7.0 to MS SQL. I've tried various things but have had no success. When installed as Standalone with Oracle XE then it works fine but cannot get onto MSQL using the PMDB.

I have tried a custom installation just to connect to MS SQL without connecting XE Oracle again no connection.

Previous versions, for example, P6 v 6.2.1 etc... came with MS SQL and the relevent files weer loaded into the MS Server in the C:\program files\MS SQL Server. This worked no problema nd the cannection is fine using sa and Prima123Vera as password.

I have tried connecting using the guide on page 67 of the Administration guide under the titled: "Creating the Database Structures for MS SQL Server and Loading Application Data", again I cannot get this to work.

If any of you can post the procedure to ensure that P6 v 7.0 will connect to MS SQL then I would be grateful. Please note installing the MS SQL 2008 Express was not a problem and connects to other software with no problems. It is just P6 v 7.0.

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